Nautical-clock register.



'11. CUNNINGHAM. NAUTICAL CLOCK REGISTER. APPLIOAITION I'ILED Amiga, 1909.

Patented Aug. 17,'i909.

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Specification attac ment.

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Application and s ace, 1909. scan n; 492,905,

To all whom it mag concern:

Be it known; that I, 'I-Hoinns CUNNING- HAM, a citizen oat-the United States,,-residi at Wenham, in the county of Essex an State of Massachusetts, have invented acertain new and useful Improvement in, Nan.-

- tical-Clock Registers, of which the following is a specification, reference being had there in to the accompanying drawings.

A sea-chart shows wthel'distance between.

certain objects, lights, buoys or other points, and also the course which; the vessel is'supposed to run in going from one of those points a to the next. In case ofa steam propelled-vessel, the speed of the vessel is known approximately and the length of time that it will take to run the course from one of the points indicated on (the, chart to the next point can be very closely: calculated, taking ,intofconsideration the normal speed of the vessel and making due allowance for winds, currents and other elements which nmy' tend'to affect the speed. hen running in the an; or in. a dense fo or when for an reason the marks or up points or beacons cannot be seen or the bell of a buoy or the fog horn cannot be heard, it is important to calculate by other means very accurately when thelcourse of the ves sel should be changed.

Heretofore it has been the practice fer the man at the wheel to jot downon a piece of orandum on the paper.

paper or in a book the time oi? departure from a certain point, calculate the length of time that should be consumed to make the run to the next point, jot that down on the paper, and also the hourand minute when the said time will expire, and the man at the wheel must either constantly carry that hour and minute in his mind, or'else must frequently refresh his memory from the memvenientand especially so in'wet and windy weather it he 1s exposed tothe Weather, as

the paper or book is usually carried in the pocket and has to be frequently taken out and put back, and -wl1en,l1echanges the course, he has to make anew calculation and jot the data down in his book, all perhaps while exposed to thewet.

The object of this invention is to provide .a device in combination with a clock to show the time of departure from any ccrtainoh ject, light, beaten or buoypas indicated on the chart, the time consumed between the time of departure and the time of arrival at All this is inconon the dial.

the next'destinat iqn, and, also the course. which the vessel issupposed-toxiun between those two points.

The invention will be understood frontthe following descriptiontaken in connection. with. the accompauyin 1 drawmgs, and the novel featnnes arepoin dent and. clearly defined in the claims at'the close of the specification. 5

In-the drawin S -Figure 1 is a, true-plan, 0t theface-of a. 0 00k having combined therewith apparatus embodying my invention. Fig. 2 is aside elevation of a clock, equ pped with my device. Fig. 3 is a side elevation, partly in section. Fig. t is a true plan of the face showing the various indicators set to a different position from that shown Fig; l to show a new time oi departure and time of arrival and course of the "vessel.

Referring to the drawings,.1 represents a clock to whiehthe apparatus embodying the invention is attached and which maybe attached to a wall, table or other support 2 in plain view of the man, at the wheel and readily accessible; The bezel 3 ofthe clock which holds'the crystal 4: is so constructed and connected with the ease or the clock that it may be easily. rotated by hand.

An index hand or pointer 5 is formed on or attached to the face Of'the crystal, preferably in the inner taco and at theouter edge or to the inner edge of the bezel, so that it moveswith the bezel-and crystal when the latter is rotated. The index 5' points ra-v dially inward. By rotating the bezel and crystal the index 5 may be made to stop 9ve'r any one of themiuute marks on the dial 6 the clock. I

- Suitablysecured to. the caseor to the bezel of the clock so as to be moved independently of the movement of the bezel and'cry'stal is another pointer 7 pointing radially inward. which also may be set over any minute mark In the form of construction shown the indicator 7 is mounted upon .a ring 8 which loosely encircles the flange 9 of the bezel so that thering 8 can be turned to set the. pointer. The ring 8 is held from full- 'iiig by the guard pins 10 projecting from-the 1 said flange 9 which enter an annular groove 15 in the case 16 and also retain the'bezclilj in connectionwith the case. A finger-piece 11 furnishes a convenient means for turning the ring 8 for the purpose of setting the pointer. v

Marked upon thc crystal 4 or upon attached-thereto are the points. of the (301111 mass. The preferredmanner of marking the points of the compass is by engraving'theln on the crystal in'such manner that they can be readily seen without obscuring the view through the crystal of the minuteand hour hands of the clock and the view of the dial.

The precise method of indicating the points.

' cured to said stud on the outer side of the crystal is a thumb-nut 14, whereby the stud may be rotated and thereby set the pointer 13 to any point of the compass; The inner end of the stud is journaled in suitable bearing.

It is obvious that instead of having the bezel and the crystal rotatable and the de-v parture time indicator 5' fixed to the crystal, the bezel and crystal may be fixed, and the indicator 5 may be made movable, for instance in a similar manner as the arrival time indicator 7 is made movable, or any other suitable means of holding it in its adjusted position and allowing it to be moved may be employed, but there should be some distinction between the appearance of the departure and arrival indicators so ttiat the navi atorcan readily distinguish which is the eparture and which is the arrival-indicator.

The method of using the apparatus is as follows: Immediately upon starting on any new course, the apparatus is set to indicate the time of departure, the time when it should arrive at the next point,1 and the course. Suppose the time at which the vessel departs-from a certain point indicated on the chart is twelve minutes of two and suppose the chart shows that the distance to the nextpoint of destination of the vessel is six miles, and. suppose the vessel is running at the rate of 10 knots an hour. after making ,duc allowance for winds and currents: that is, a knot in six minutes, so that it would, or ought to, take 36 minutes to run the course to the next point. That is, if the time of departure is twelve minutes of two, it should arrive at the end of that course at twentyfour minutes past two, and it would then be utes past the hour as shown in Fig. 4. Sup pose the chart shows that the direction of the course is north-easti The pointer 13 is moved by means of the thumb-nut let. to

point to the northeast point of the compass as also shown in Fig. 4;. The apparatus is now fully set so that the man at the wheel can tell by a single glance at the clock at any time the courseon which the vessel is a running, the exact time when the vessel left the last point and when the vessel is due, at

the next point where the course of the ves sel should be changed. As he approaches" that point, he will be on an especially sharp lookout for any signal that there may be,

such as a light or buoy or hell. If. the" weather is so thick or foggy, that the biioy or other markis invisible, he will immediately change his course as called for by the chart as soon as the timehas expired when heis due at the )ointwhere the change should be made. ii the signal is a belhand he does. not hear the hell, he willfuse his judgment whether to run' a'short distance farther on the course before changing on the assumption that the vessel may have slowed up in its speed. When the course-is'change'd,

mar zed ointsotthe compass, hour'and minute bands which move with the clock and two independently adjustable pointers which are adapted-to be set to register respectively the time of departure from any particular 105 point and the anticipated time of arrival at anotherpoint v 2. In combination with alclock, a rota table crystal having a marker whereby the time of departure from a articular point 11 may be registered, adjustab e means for indicating at the time of departure the anticipated time of; future arrival at the destina v tion and ad ustable means for re istering the course on which the vessel should minute hands, two independently adjustable pointers which may beset to register different points on the dial of the clock, means for, v

adapted to be set at any one of the said The run. 1&5 3. In combination wlth a clock, hour and j setting the said pointers, a crystal for said 12 0 clock having indicated thereon the points of, the compass and a movable pointer adapted to be set at any one of the marked points o the compass.

In combination with a cloclrhaving-a 125.

dial with minutes and hours marked thereon and hour and minute hands moved by the clock mechanism, a crystal face for said clock, a rotatable bezel which holds said crystal, a pointer at the outer periphery of 1 0 mi-mite on the dial by i'otat'ing, sald bezel,a

second pointer securedflontside of said. bezel and polntin radially inward and movable 'independenty .of said bezel adapted to" be.

set to Point to any particular minute on the dial 0 the clock, the crystal having formed thereon marksindicating the :points of the compass, and a rotatable stud passing centrally through said. exj'ystal and .having outward and adapted to be set to any one of mounted thereon a pointei' pointing radia11 y the compass points marked on said crystal 1 and means for moving said pointers.

I In testimony whereof I afiix my'signature,

in presenceof two Witnesses THOMAS CUNNINGHAM.

-Witnesses: V

WILLIAM A. COPE AND, ALICE H. MORRISON. 

